Is CVE-2023-34326 in the CISA KEV catalog?

No. CVE-2023-34326 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-34326?

CVE-2023-34326 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2023-34326?

CVE-2023-34326 has an EPSS score of 0.29% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-34326?

Upgrade xen on debian 12 to 4.17.2+76-ge1f9cb16e2-1~deb12u1 or later.

CVE & CISA-KEV Catalog

CVE-2023-34326

HIGH

7.8

CVSS v3

NVD

Description

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed. Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

CWE-672

How to fix

Remediation Available

xenDebian

Fixed in:4.17.2+76-ge1f9cb16e2-1~deb12u1CVE-2023-34326

Fixed in:4.17.2+55-g0b56bed864-1CVE-2023-34326

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.29%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Vendor Advisory1

xenbits.xenproject.org

Other references1

xenbits.xen.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.